The sex toy shipments are never-ending, but being in a relationship with 27-year-old sexpert Jill McDevitt means you might end up with exploding candy on your penis.

Sexologist Jill McDevitt, PhD, teaches women how to give hand jobs on carrots, schools college classes on the female orgasm, and sells lipstick vibrators at her Pennsylvania sex shop, Feminique (slogan: "Get Your Heart On!") How does all of this impact her relationship with her live-in beau of five years, an engineer named Ryan?

He gets to be an erotic guinea pig. "Sex product manufacturers send me boxes of free stuff in hopes I'll blog about it or sell the item. So I 'make him' try out so many lubes, oils, sex slings, and toys. I took him on an all-expenses-paid trip to Florida for a sex toy trade show. We spent the days lounging by the pool and the nights attending workshops and demonstrations on the latest and greatest sex products on the market."

But sometimes it backfires. "One product I tried out on Ryan was 'BJ Blast,' which was basically rebranded Pop Rocks candy. So I gave him oral sex with the Pop Rock stuff in my mouth and apparently it was NOT a pleasant experience when the rocks 'blew up' on his penis."

His personal electronics are compromised. "Ryan's phone stopped working and a mysterious unidentified liquid oozed out of it. Turns out my lube bottle spilled on it. #datingasexologist," Jill tweeted this week.

"Recently I was complaining about how my printer was broken and I was going to have to buy a new one. He said he would take a look: It ended up that a garter strap was stuck in the paper roller that he had to pull out. We both laughed our asses off. It was one of those 'only a sexologist' moments."

She never complains about feeling fat. "The best part of dating a sexologist is that I don't have any body image hang-ups. I'm comfortable in my own sexuality and I can share that with him. I openly say, 'Hey, I wanna try this' or 'I want to be stimulated that way.' If you want or need something, you have to feel comfortable saying it. On the flip side, if your partner comes to you with a need or want, you can't take it as an insult. You have to be able to both say it and hear it."

She's sort of like a biology teacher in bed. "I always use proper, medically accurate terminology, even in the heat of the moment. For example, I use glans penis, posterior vaginal wall, etc. He's just like, 'This is not a sexy way to describe what's happening right now.'"

And a sex-ed teacher. "Ryan and I have been together for five years and living together for two and a half, but we've never had sex without a condom. He is not a huge fan of this fact, but I teach safe sex to kids, and I do practice what I preach as far as pregnancy prevention."

Also: "I will make scenes in public if something strikes me as not being sex-positive. We were buying condoms at a Wawa and I noticed they were tucked behind the counter and started lecturing them about how that's going to scare people away from buying them and encourage unsafe sex! Sometimes he's just like, 'Here we go....'"

She brings out his feminist side. "Whether it's a rally about birth control access, sexual violence, LGBT pride, or any other sexuality-related political event, he comes with. We went on vacation to the Dominican Republic, and I told him I had to do humanitarian work while we were down there, and so we spent a whole day of our trip teaching sex education to impoverished girls at risk for sexual exploitation and child prostitution."

He's down with her kissing other women/vacationing with other dudes. "When Chick-Fil-A was under a lot of heat from the LGBT community, there was a kiss-off protest, so I went and kissed a bunch of women in protest. Ryan was just like, 'Have fun.' He's a very comfortable, very confident person. My best friend is a man and he and I spend a lot of time together alone, we'll go away for the weekend, and Ryan is just secure."

They're still a normal couple. "Yes, we do have awesome sex. It is a big help to know a lot about sex. But we are like other couples in that we have issues with frequency. In the time we've been dating, he's been finishing college, I've been going through grad school and launching a business, so sometimes we get tired."

Above all, he's loves her for her character, not just her carnal knowledge. "He's always been more impressed with the fact that I own a small business and am going through graduate school as he is that he's dating a sex expert. I love Ryan, but I think more importantly, I like Ryan. He dances with me out on the dancefloor, travels with me to exotic locations, and we read together every night."